diff --git a/src/system/kernel/convertutf.cpp b/src/system/kernel/convertutf.cpp
index 897e580dee..b1e27901a3 100644
--- a/src/system/kernel/convertutf.cpp
+++ b/src/system/kernel/convertutf.cpp
@@ -34,7 +34,7 @@ glyph_length(uint32 glyph)
 }
 
 
-void
+static void
 encode_glyph(uint32 glyph, size_t glyphLength, char* buffer)
 {
 	if (glyphLength == 1) {